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Subject[PATCH ipmi/kcs_bmc v1] ipmi: kcs_bmc: optimize the data buffers allocation
Date
Allocate a continuous memory block for the three KCS data buffers with
related index assignment.

Signed-off-by: Haiyue Wang <haiyue.wang@linux.intel.com>
---
drivers/char/ipmi/kcs_bmc.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/char/ipmi/kcs_bmc.c b/drivers/char/ipmi/kcs_bmc.c
index fbfc05e..dc19c0d 100644
--- a/drivers/char/ipmi/kcs_bmc.c
+++ b/drivers/char/ipmi/kcs_bmc.c
@@ -435,6 +435,7 @@ static const struct file_operations kcs_bmc_fops = {
struct kcs_bmc *kcs_bmc_alloc(struct device *dev, int sizeof_priv, u32 channel)
{
struct kcs_bmc *kcs_bmc;
+ void *buf;

kcs_bmc = devm_kzalloc(dev, sizeof(*kcs_bmc) + sizeof_priv, GFP_KERNEL);
if (!kcs_bmc)
@@ -448,11 +449,12 @@ struct kcs_bmc *kcs_bmc_alloc(struct device *dev, int sizeof_priv, u32 channel)
mutex_init(&kcs_bmc->mutex);
init_waitqueue_head(&kcs_bmc->queue);

- kcs_bmc->data_in = devm_kmalloc(dev, KCS_MSG_BUFSIZ, GFP_KERNEL);
- kcs_bmc->data_out = devm_kmalloc(dev, KCS_MSG_BUFSIZ, GFP_KERNEL);
- kcs_bmc->kbuffer = devm_kmalloc(dev, KCS_MSG_BUFSIZ, GFP_KERNEL);
- if (!kcs_bmc->data_in || !kcs_bmc->data_out || !kcs_bmc->kbuffer)
+ buf = devm_kmalloc_array(dev, 3, KCS_MSG_BUFSIZ, GFP_KERNEL);
+ if (!buf)
return NULL;
+ kcs_bmc->data_in = buf;
+ kcs_bmc->data_out = buf + KCS_MSG_BUFSIZ;
+ kcs_bmc->kbuffer = buf + KCS_MSG_BUFSIZ * 2;

kcs_bmc->miscdev.minor = MISC_DYNAMIC_MINOR;
kcs_bmc->miscdev.name = dev_name(dev);
--
2.7.4
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